Bug 1515873 - Remove aWindowId arg from MediaManager::GetBackend. r=jib

It is unused.

Differential Revision: https://phabricator.services.mozilla.com/D15630

--HG--
extra : moz-landing-system : lando

dom/media/MediaManager.cpp

@@ -1845,7 +1845,7 @@ RefPtr<MediaManager::MgrPromise> MediaManager::EnumerateRawDevices(
     if (realDeviceRequested) {
       MediaManager* manager = MediaManager::GetIfExists();
       MOZ_RELEASE_ASSERT(manager);  // Must exist while media thread is alive
-      realBackend = manager->GetBackend(aWindowId);
+      realBackend = manager->GetBackend();
     }
 
     if (hasVideo) {
@@ -2173,9 +2173,9 @@ int MediaManager::AddDeviceChangeCallback(DeviceChangeCallback* aCallback) {
     MOZ_RELEASE_ASSERT(manager);  // Must exist while media thread is alive
     // this is needed in case persistent permission is given but no gUM()
     // or enumeration() has created the real backend yet
-    manager->GetBackend(0);
+    manager->GetBackend();
     if (fakeDeviceChangeEventOn)
-      manager->GetBackend(0)->SetFakeDeviceChangeEvents();
+      manager->GetBackend()->SetFakeDeviceChangeEvents();
   }));
 
   return DeviceChangeCallback::AddDeviceChangeCallback(aCallback);
@@ -3345,7 +3345,7 @@ nsresult MediaManager::GetUserMediaDevices(
   return NS_ERROR_UNEXPECTED;
 }
 
-MediaEngine* MediaManager::GetBackend(uint64_t aWindowId) {
+MediaEngine* MediaManager::GetBackend() {
   MOZ_ASSERT(MediaManager::IsInMediaThread());
   // Plugin backends as appropriate. The default engine also currently
   // includes picture support for Android.

dom/media/MediaManager.h

@@ -177,7 +177,7 @@ class MediaManager final : public nsIMediaManagerService,
   NS_DECL_NSIMEDIAMANAGERSERVICE
 
   media::Parent<media::NonE10s>* GetNonE10sParent();
-  MediaEngine* GetBackend(uint64_t aWindowId = 0);
+  MediaEngine* GetBackend();
 
   WindowTable* GetActiveWindows() {
     MOZ_ASSERT(NS_IsMainThread());